As far as I can see there are the problems in eclipse are:

1) In the documentation module the asciidoctor-maven-plugin is not recognized
2) In the annotation-processor module the JDK for tests should be 1.8 instead of 1.6
3) In the module integration-test-wildfly the execution copy-hv-cdi-snapshot show an error:

Error copying artifact from /home/ddalto/workspace/projects/hibernate-validator/cdi/target/classes to /home/ddalto/workspace/projects/hibernate-validator/integration/target/wildfly-8.0.0.Final/modules/system/layers/base/org/hibernate/validator/cdi/main/hibernate-validator-cdi-5.2.0-SNAPSHOT.jar (org.apache.maven.plugins:maven-dependency-plugin:2.4:copy:copy-hv-cdi-snapshot:process-test-resources)

Possible solutions:
1) I will try [ ~hardy.ferentschik ] suggested approach with the external file
2) I don;t think there is a solution for this, I can update the documentation. THe solution I usually apply is to us the jdk 1.8 libraries for the JavaSE-1.6 runtime
3) Seems related to the java version, it disappear when I use jdk 1.8